move locally and compute the vertex of segment while moving

[jangbi]

Here's the demo.

https://www.babylonjs-playground.com/#LS4I1S

Firstly, I want to move the cylinder forward(in local axes), so i use mesh.translate(BABYLON.Vector3.Forward(), 1). The cylinder move 1 unit in the y axis instead of z axis(that's what i want), I can understand why the cylinder move in the y axis(because of the rotation), but I want to know how to move the cylinder on the x-z plane forward after rotation by using the local frame of reference.

Secondly, how to compute the segments' two end points dynamically, is my code right?

this.mesh.computeWorldMatrix();
let matrix = this.mesh.getWorldMatrix(true);
this.vertex1 = BABYLON.Vector3.TransformCoordinates(this.vertex1, matrix);
this.vertex2 = BABYLON.Vector3.TransformCoordinates(this.vertex2, matrix);

(My english is poor, please forgive me)

[JohnK]

Does this help you? https://doc.babylonjs.com/features/position,_rotation,_scaling#move-by-methods

[jangbi]

@JohnK I've already read that page. Be more specifically, in this demo, i want to move the cylinder's location to (0,0,1), but not using the position.z += 1, use the local frame of reference and a local orientation vector to finish the translation.And calculate the correct segment's vertex position while need it.

[JohnK]

It seems to me that you want to move in world space not local space https://www.babylonjs-playground.com/#LS4I1S#1

or if you want to use local axes  then you need to move in the y direction https://www.babylonjs-playground.com/#LS4I1S#2

NOTE -  BABYLON.Vector3.Forward() = BABYLON.Axis.Z = (0, 0, 1)

This might be worth a read as well